High-intensity, high-quality beams originating from the electron-cooling method will be utilized for medical and other application at HIMAC. As a first step, an electron cooler with an adiabatic expansion factor of 10 has been designed and is under construction at HIMAC. So far, field measurements of the cooler have been completed. In this paper, the present status of the electron cooler under construction is described, and plans of medical and other application by using the electron-cooling method at HIMAC are presented.

Electron cooler for medical and other application at HIMAC

An electron cooler had been designed and constructed in order to provide high-quality and high-intensity beam for medical and other application, and was installed at HIMAC-synchrotron. In the initial experiment of the electron cooler, a momentum spread is reduced from 10 -3 -5 at FWHM by the longitudinal bunched beam cooling. The vertical beam-size at FWHM is reduced to one-third, and the cool stacking is successfully observed owing to the transverse cooling. The paper reports the results of the initial experiment of the electron cooling at HIMAC.

Commissioning of electron cooler for medical and other application at himac

Light ions in the mass range up to neon may have important advantages in the treatment of certain types of cancer compared to conventional radiation. Any treatment of cancer has the objective to remove or destroy the tumor while preserving at the same time the healthy tissue as much as possible. For comparison, radiological properties of several types of radiation will be considered first; this will be followed with a list of light ion beam parameters needed for the treatment. A short description of operating and planned facilities will then be given, including the Electron Beam Ion Source (EBIS) option for the ion source in such a facility.

Medical applications of light ions

Since 1994 clinical trials have been performed successfully with carbon beam. To improve the clinical result further, new irradiation systems are under development such as a 3D-irradiation system and a verification system of range with positron emitter. There are also improvements on the accelerator performances. One is the wide range of ion species; the others are concerned with the machine devices and new beam monitors to get good machine operation. In this report we present current status of HIMAC.

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N. Miyahara

Papers

Present status of HIMAC at NIRS